In other words, his disposition was very similar to that of a pig--he was intensely selfish.
No one had any right to condemn him for this, because all who live under the present system practise selfishness, more or less.

We must be selfish: the System demands it.

We must be selfish or we shall be hungry and ragged and finally die in the gutter.

The more selfish we are the better off we shall be.

In the 'Battle of Life' only the selfish and cunning are able to survive: all others are beaten down and trampled under foot.